Smart Poly® Learning Mat 12"x17", Double-Sided, Base Ten 0-120. Learn about using base ten numbers to count to 120. Visualize with color coded blocks, the number and the number spelled out. Heavy duty double-sided surface for fun and colorful learning on both sides. Write-on/ wipe-off surface. Use with dry erase or water based markers and washable crayons. Each side is an interactive lesson.